package com.rsy.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.rsy.common.To.es.SkuEsModel;
import com.rsy.common.utils.R;
import com.rsy.search.config.GulimallElasticSerachConfig;
import com.rsy.search.constant.EsConstant;
import com.rsy.search.feign.ProducteFeignService;
import com.rsy.search.service.MallSearchService;
import com.rsy.search.vo.AttrResponseVo;
import com.rsy.search.vo.BrandVo;
import com.rsy.search.vo.SearchParam;
import com.rsy.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.apache.tomcat.jni.Proc;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {


    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProducteFeignService producteFeignService;
    /**
     * 检索
     * @param searchParam
     * @return
     */
    @Override
    public SearchResult search(SearchParam searchParam) {

        SearchResult searchResult = null;  // 结果封装

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(searchParam);
        try {
            //2、执行检索请求
            SearchResponse search = client.search(searchRequest, GulimallElasticSerachConfig.COMMON_OPTIONS);
            //3、分析响应数据封装成我们需要的格式
            searchResult = buildSearchResult(search,searchParam);
        } catch (IOException e) {

            e.printStackTrace();
        }


        return searchResult;
    }


    /**
     * 准备检索请求
     * 动态构建出查询需要的DSL语句
     * 模糊匹配、过滤（按照属性、分类、品牌、价格区间、库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句的
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //1、构建bool 、 query 模糊匹配、过滤（按照属性、分类、品牌、价格区间、库存）
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2.1 filter-按照三级分类id查询
        if (null != param.getCatalog3Id()){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2.2 filter-按照品牌id查询
        if (null != param.getBrandId() && param.getBrandId().size()>0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2.3 filter-按照是否有库存进行查询
        if (null != param.getHasStock() ) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
        //1.2.4 filter-按照区间进行查询  1_500/_500/500_
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
            String[] prices = param.getSkuPrice().split("_"); //分裂
            if (prices.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    //小于
                    rangeQueryBuilder.lte(Integer.parseInt(prices[0]));
                }else {
                    //大于
                    rangeQueryBuilder.gte(Integer.parseInt(prices[0]));
                }
            } else if (prices.length == 2) {
                //_6000会截取成["","6000"]
                if (!prices[0].isEmpty()) {
                    rangeQueryBuilder.gte(Integer.parseInt(prices[0]));
                }
                rangeQueryBuilder.lte(Integer.parseInt(prices[1]));
            }
            boolQuery.filter(rangeQueryBuilder);
        }

        //1.1.5 filter-按照属性  &attrs=1_5寸:8寸&attrs=2_16G:8G
        /**
         * "nested": {
         *         "path": "attrs",
         *         "query": {
         *             "bool": {
         *                 "must": [
         *                     {
         *                         "term": {
         *                             "attrs.attrId": {
         *                                 "value": "6"
         */

        if (param.getAttrs()!=null && param.getAttrs().size()>0){

            //每个属性都需要nested查询()
            param.getAttrs().forEach(attr -> {
                //query是一个 bool
                BoolQueryBuilder nestedBool = QueryBuilders.boolQuery();
                //attr=1_5寸:8寸
                //分为：id=1===值5寸:8寸
                String[] attrSplit = attr.split("_");
                nestedBool.must(QueryBuilders.termQuery("attrs.attrId",attrSplit[0]));
                //值5寸 <===> 8寸
                String[] attrValues = attrSplit[1].split(":");
                nestedBool.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));

                //嵌入式属性  ScoreMode.None => 不参与评分 query => 条件
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBool, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            });

        }
        //将所有的查询条件封装 -> query
        sourceBuilder.query(boolQuery);

        //2.1排序 sort=saleCount_asc/desc
        if (!StringUtils.isEmpty(param.getSort())){
            String[] sortSplit = param.getSort().split("_");
            //equalsIgnoreCase -> 等于忽略大小写
            sourceBuilder.sort(sortSplit[0],sortSplit[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC);
        }

        //2.2 分页
        sourceBuilder.from((param.getPageNum() -1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }


        //聚合
        /**
         * 聚合分析
         */
        //5. 聚合
        //5.1 按照品牌聚合 brandId
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        //品牌聚合的子聚合
        TermsAggregationBuilder brand_name_agg = AggregationBuilders.terms("brand_name_agg").field("brandName").size(1);
        TermsAggregationBuilder brand_img_agg = AggregationBuilders.terms("brand_img_agg").field("brandImg");
        brand_agg.subAggregation(brand_name_agg);
        brand_agg.subAggregation(brand_img_agg);
        sourceBuilder.aggregation(brand_agg);

        //5.2 按照catalog聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        TermsAggregationBuilder catalog_name_agg = AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1);
        catalog_agg.subAggregation(catalog_name_agg);
        sourceBuilder.aggregation(catalog_agg);

        //5.3 按照attrs聚合 Nested 嵌入式
        NestedAggregationBuilder nestedAggregationBuilder = new NestedAggregationBuilder("attr_agg", "attrs");
        //按照attrId聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //按照attrId聚合之后再按照attrName和attrValue聚合
        TermsAggregationBuilder attr_name_agg = AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1);
        TermsAggregationBuilder attr_value_agg = AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50);
        attr_id_agg.subAggregation(attr_name_agg);
        attr_id_agg.subAggregation(attr_value_agg);

        nestedAggregationBuilder.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(nestedAggregationBuilder);


        //检索结果
        String s = sourceBuilder.toString();
        System.out.println(s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX},sourceBuilder);
        return searchRequest;
    }

    /**
     * 结果返回封装
     * @param
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();
        //es销售属性
        List<SkuEsModel> esModels = new ArrayList<>();
        if (null != hits.getHits() && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                //销售属性信息
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    //高亮
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    esModel.setSkuTitle(skuTitle.fragments()[0].string());
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);
        //2、当前所有商品涉及到的所有属性 聚合属性
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id;
            long attrId = bucket.getKeyAsNumber().longValue();
            //2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);
        //3、当前所有品牌涉及到的所有属性
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2、得到品牌的名
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4、当前商品所涉及的分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //===========以上从聚合信息获取到=============
        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //6、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7、分页信息-总页码-计算
        int totalPages = total%EsConstant.PRODUCT_PAGESIZE == 0 ?
                        (int) total/EsConstant.PRODUCT_PAGESIZE
                        :((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6、构建面包屑导航功能
        List<String> attrs = param.getAttrs();
        if (attrs != null && attrs.size() > 0) {
            List<SearchResult.NavVo> navVos = attrs.stream().map(attr -> {
                String[] split = attr.split("_");
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //6.1 设置属性值
                navVo.setNavValue(split[1]);
                //6.2 查询并设置属性名
                try {
                    R r = producteFeignService.attrInfo(Long.parseLong(split[0]));
                    result.getAttrIds().add(Long.valueOf(split[0]));
                    if (r.getCode() == 0) {
                        AttrResponseVo attrResponseVo = JSON.parseObject(JSON.toJSONString(r.get("attr")), new TypeReference<AttrResponseVo>() {
                        });
                        navVo.setNavName(attrResponseVo.getAttrName());
                    }else {
                        navVo.setNavName(split[0]);
                    }
                } catch (Exception e) {

                }
                //6.3 设置面包屑跳转链接(当点击该链接时剔除点击属性)
                //取消了这个面包屑以后，我们就要跳转到那个地方，将请求地址的url里面的当前置空
                //拿到所有的查询条件，去掉当前

                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html" + (replace.isEmpty()?"":"?"+replace));
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }
        //品牌、分类
        if (null != param.getBrandId() && param.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = producteFeignService.brandInfo(param.getBrandId());
            if (0 == r.getCode()){
                List<BrandVo> brands = r.getData("brands", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brand : brands) {
                    buffer.append(brand.getName()+";");
                    replace = replaceQueryString(param, brand.getBrandId()+"","attrs");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html" + (replace.isEmpty()?"":"?"+replace));
            }
            navs.add(navVo);
        }
        //TODO 分类，不需要导航取消


        return result;
    }

    private String replaceQueryString(SearchParam param, String value,String key) {
        String queryString = param.get_queryString();
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+","20%");//浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return queryString.replace("&"+key+"=" + encode, "");
    }

    public static void main(String[] args) {
        String s = "111";
        System.out.println(StringUtils.isEmpty(s));
    }

}


